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This Optolong H-Beta filter has a FWHM of 25nm, making it more suitable for visual observations of the Horsehead, California, and Cocoon nebulae. The filter transmits a 25nm bandwidth of light that is centered at 486nm and precision blocks other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural). When you use the 25nm H-Beta filter, you’ll notice that the contrast between the background sky and objects that emit H-Beta light increases. This allows you to see these elusive objects more easily, but you will still need a telescope with an aperture of at least 8” and a night of good seeing.
The Optolong 1.25” H-Beta 25nm Filter is made with Schott glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL. The filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted, black anodized, and then laser engraved. The result is a super thin filter cell that will produce a clear aperture of 26mm.
Interested Please Contact 017-6063060/011-11230602/03-40317167
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